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-rw-r--r--src/libsystemd/src/sd-device/device-private.c1119
1 files changed, 1119 insertions, 0 deletions
diff --git a/src/libsystemd/src/sd-device/device-private.c b/src/libsystemd/src/sd-device/device-private.c
new file mode 100644
index 0000000000..03c04b5eae
--- /dev/null
+++ b/src/libsystemd/src/sd-device/device-private.c
@@ -0,0 +1,1119 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
+ Copyright 2014 Tom Gundersen <teg@jklm.no>
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <ctype.h>
+#include <net/if.h>
+#include <sys/types.h>
+
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/fd-util.h"
+#include "systemd-basic/fileio.h"
+#include "systemd-basic/fs-util.h"
+#include "systemd-basic/hashmap.h"
+#include "systemd-basic/macro.h"
+#include "systemd-basic/mkdir.h"
+#include "systemd-basic/parse-util.h"
+#include "systemd-basic/path-util.h"
+#include "systemd-basic/refcnt.h"
+#include "systemd-basic/set.h"
+#include "systemd-basic/string-table.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/strv.h"
+#include "systemd-basic/strxcpyx.h"
+#include "systemd-basic/user-util.h"
+#include "systemd-basic/util.h"
+#include "systemd-staging/sd-device.h"
+
+#include "device-internal.h"
+#include "device-private.h"
+#include "device-util.h"
+
+int device_add_property(sd_device *device, const char *key, const char *value) {
+ int r;
+
+ assert(device);
+ assert(key);
+
+ r = device_add_property_aux(device, key, value, false);
+ if (r < 0)
+ return r;
+
+ if (key[0] != '.') {
+ r = device_add_property_aux(device, key, value, true);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int device_add_property_internal_from_string(sd_device *device, const char *str) {
+ _cleanup_free_ char *key = NULL;
+ char *value;
+
+ assert(device);
+ assert(str);
+
+ key = strdup(str);
+ if (!key)
+ return -ENOMEM;
+
+ value = strchr(key, '=');
+ if (!value)
+ return -EINVAL;
+
+ *value = '\0';
+
+ if (isempty(++value))
+ value = NULL;
+
+ return device_add_property_internal(device, key, value);
+}
+
+static int handle_db_line(sd_device *device, char key, const char *value) {
+ char *path;
+ int r;
+
+ assert(device);
+ assert(value);
+
+ switch (key) {
+ case 'S':
+ path = strjoina("/dev/", value);
+ r = device_add_devlink(device, path);
+ if (r < 0)
+ return r;
+
+ break;
+ case 'L':
+ r = safe_atoi(value, &device->devlink_priority);
+ if (r < 0)
+ return r;
+
+ break;
+ case 'E':
+ r = device_add_property_internal_from_string(device, value);
+ if (r < 0)
+ return r;
+
+ break;
+ case 'G':
+ r = device_add_tag(device, value);
+ if (r < 0)
+ return r;
+
+ break;
+ case 'W':
+ r = safe_atoi(value, &device->watch_handle);
+ if (r < 0)
+ return r;
+
+ break;
+ case 'I':
+ r = device_set_usec_initialized(device, value);
+ if (r < 0)
+ return r;
+
+ break;
+ default:
+ log_debug("device db: unknown key '%c'", key);
+ }
+
+ return 0;
+}
+
+void device_set_devlink_priority(sd_device *device, int priority) {
+ assert(device);
+
+ device->devlink_priority = priority;
+}
+
+void device_set_is_initialized(sd_device *device) {
+ assert(device);
+
+ device->is_initialized = true;
+}
+
+int device_ensure_usec_initialized(sd_device *device, sd_device *device_old) {
+ char num[DECIMAL_STR_MAX(usec_t)];
+ usec_t usec_initialized;
+ int r;
+
+ assert(device);
+
+ if (device_old && device_old->usec_initialized > 0)
+ usec_initialized = device_old->usec_initialized;
+ else
+ usec_initialized = now(CLOCK_MONOTONIC);
+
+ r = snprintf(num, sizeof(num), USEC_FMT, usec_initialized);
+ if (r < 0)
+ return -errno;
+
+ r = device_set_usec_initialized(device, num);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static int device_read_db(sd_device *device) {
+ _cleanup_free_ char *db = NULL;
+ char *path;
+ const char *id, *value;
+ char key;
+ size_t db_len;
+ unsigned i;
+ int r;
+
+ enum {
+ PRE_KEY,
+ KEY,
+ PRE_VALUE,
+ VALUE,
+ INVALID_LINE,
+ } state = PRE_KEY;
+
+ assert(device);
+
+ if (device->db_loaded || device->sealed)
+ return 0;
+
+ r = device_get_id_filename(device, &id);
+ if (r < 0)
+ return r;
+
+ path = strjoina("/run/udev/data/", id);
+
+ r = read_full_file(path, &db, &db_len);
+ if (r < 0) {
+ if (r == -ENOENT)
+ return 0;
+ else
+ return log_debug_errno(r, "sd-device: failed to read db '%s': %m", path);
+ }
+
+ /* devices with a database entry are initialized */
+ device_set_is_initialized(device);
+
+ for (i = 0; i < db_len; i++) {
+ switch (state) {
+ case PRE_KEY:
+ if (!strchr(NEWLINE, db[i])) {
+ key = db[i];
+
+ state = KEY;
+ }
+
+ break;
+ case KEY:
+ if (db[i] != ':') {
+ log_debug("sd-device: ignoring invalid db entry with key '%c'", key);
+
+ state = INVALID_LINE;
+ } else {
+ db[i] = '\0';
+
+ state = PRE_VALUE;
+ }
+
+ break;
+ case PRE_VALUE:
+ value = &db[i];
+
+ state = VALUE;
+
+ break;
+ case INVALID_LINE:
+ if (strchr(NEWLINE, db[i]))
+ state = PRE_KEY;
+
+ break;
+ case VALUE:
+ if (strchr(NEWLINE, db[i])) {
+ db[i] = '\0';
+ r = handle_db_line(device, key, value);
+ if (r < 0)
+ log_debug_errno(r, "sd-device: failed to handle db entry '%c:%s': %m", key, value);
+
+ state = PRE_KEY;
+ }
+
+ break;
+ default:
+ assert_not_reached("invalid state when parsing db");
+ }
+ }
+
+ device->db_loaded = true;
+
+ return 0;
+}
+
+uint64_t device_get_properties_generation(sd_device *device) {
+ assert(device);
+
+ return device->properties_generation;
+}
+
+uint64_t device_get_tags_generation(sd_device *device) {
+ assert(device);
+
+ return device->tags_generation;
+}
+
+uint64_t device_get_devlinks_generation(sd_device *device) {
+ assert(device);
+
+ return device->devlinks_generation;
+}
+
+int device_get_devnode_mode(sd_device *device, mode_t *mode) {
+ int r;
+
+ assert(device);
+ assert(mode);
+
+ r = device_read_db(device);
+ if (r < 0)
+ return r;
+
+ *mode = device->devmode;
+
+ return 0;
+}
+
+int device_get_devnode_uid(sd_device *device, uid_t *uid) {
+ int r;
+
+ assert(device);
+ assert(uid);
+
+ r = device_read_db(device);
+ if (r < 0)
+ return r;
+
+ *uid = device->devuid;
+
+ return 0;
+}
+
+static int device_set_devuid(sd_device *device, const char *uid) {
+ unsigned u;
+ int r;
+
+ assert(device);
+ assert(uid);
+
+ r = safe_atou(uid, &u);
+ if (r < 0)
+ return r;
+
+ r = device_add_property_internal(device, "DEVUID", uid);
+ if (r < 0)
+ return r;
+
+ device->devuid = u;
+
+ return 0;
+}
+
+int device_get_devnode_gid(sd_device *device, gid_t *gid) {
+ int r;
+
+ assert(device);
+ assert(gid);
+
+ r = device_read_db(device);
+ if (r < 0)
+ return r;
+
+ *gid = device->devgid;
+
+ return 0;
+}
+
+static int device_set_devgid(sd_device *device, const char *gid) {
+ unsigned g;
+ int r;
+
+ assert(device);
+ assert(gid);
+
+ r = safe_atou(gid, &g);
+ if (r < 0)
+ return r;
+
+ r = device_add_property_internal(device, "DEVGID", gid);
+ if (r < 0)
+ return r;
+
+ device->devgid = g;
+
+ return 0;
+}
+
+static int device_amend(sd_device *device, const char *key, const char *value) {
+ int r;
+
+ assert(device);
+ assert(key);
+ assert(value);
+
+ if (streq(key, "DEVPATH")) {
+ char *path;
+
+ path = strjoina("/sys", value);
+
+ /* the caller must verify or trust this data (e.g., if it comes from the kernel) */
+ r = device_set_syspath(device, path, false);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device: could not set syspath to '%s': %m", path);
+ } else if (streq(key, "SUBSYSTEM")) {
+ r = device_set_subsystem(device, value);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device: could not set subsystem to '%s': %m", value);
+ } else if (streq(key, "DEVTYPE")) {
+ r = device_set_devtype(device, value);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device: could not set devtype to '%s': %m", value);
+ } else if (streq(key, "DEVNAME")) {
+ r = device_set_devname(device, value);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device: could not set devname to '%s': %m", value);
+ } else if (streq(key, "USEC_INITIALIZED")) {
+ r = device_set_usec_initialized(device, value);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device: could not set usec-initialized to '%s': %m", value);
+ } else if (streq(key, "DRIVER")) {
+ r = device_set_driver(device, value);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device: could not set driver to '%s': %m", value);
+ } else if (streq(key, "IFINDEX")) {
+ r = device_set_ifindex(device, value);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device: could not set ifindex to '%s': %m", value);
+ } else if (streq(key, "DEVMODE")) {
+ r = device_set_devmode(device, value);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device: could not set devmode to '%s': %m", value);
+ } else if (streq(key, "DEVUID")) {
+ r = device_set_devuid(device, value);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device: could not set devuid to '%s': %m", value);
+ } else if (streq(key, "DEVGID")) {
+ r = device_set_devgid(device, value);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device: could not set devgid to '%s': %m", value);
+ } else if (streq(key, "DEVLINKS")) {
+ const char *word, *state;
+ size_t l;
+
+ FOREACH_WORD(word, l, value, state) {
+ char devlink[l + 1];
+
+ strncpy(devlink, word, l);
+ devlink[l] = '\0';
+
+ r = device_add_devlink(device, devlink);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device: could not add devlink '%s': %m", devlink);
+ }
+ } else if (streq(key, "TAGS")) {
+ const char *word, *state;
+ size_t l;
+
+ FOREACH_WORD_SEPARATOR(word, l, value, ":", state) {
+ char tag[l + 1];
+
+ (void)strncpy(tag, word, l);
+ tag[l] = '\0';
+
+ r = device_add_tag(device, tag);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device: could not add tag '%s': %m", tag);
+ }
+ } else {
+ r = device_add_property_internal(device, key, value);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device: could not add property '%s=%s': %m", key, value);
+ }
+
+ return 0;
+}
+
+static const char* const device_action_table[_DEVICE_ACTION_MAX] = {
+ [DEVICE_ACTION_ADD] = "add",
+ [DEVICE_ACTION_REMOVE] = "remove",
+ [DEVICE_ACTION_CHANGE] = "change",
+ [DEVICE_ACTION_MOVE] = "move",
+ [DEVICE_ACTION_ONLINE] = "online",
+ [DEVICE_ACTION_OFFLINE] = "offline",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(device_action, DeviceAction);
+
+static int device_append(sd_device *device, char *key, const char **_major, const char **_minor, uint64_t *_seqnum,
+ DeviceAction *_action) {
+ DeviceAction action = _DEVICE_ACTION_INVALID;
+ uint64_t seqnum = 0;
+ const char *major = NULL, *minor = NULL;
+ char *value;
+ int r;
+
+ assert(device);
+ assert(key);
+ assert(_major);
+ assert(_minor);
+ assert(_seqnum);
+ assert(_action);
+
+ value = strchr(key, '=');
+ if (!value) {
+ log_debug("sd-device: not a key-value pair: '%s'", key);
+ return -EINVAL;
+ }
+
+ *value = '\0';
+
+ value++;
+
+ if (streq(key, "MAJOR"))
+ major = value;
+ else if (streq(key, "MINOR"))
+ minor = value;
+ else {
+ if (streq(key, "ACTION")) {
+ action = device_action_from_string(value);
+ if (action == _DEVICE_ACTION_INVALID)
+ return -EINVAL;
+ } else if (streq(key, "SEQNUM")) {
+ r = safe_atou64(value, &seqnum);
+ if (r < 0)
+ return r;
+ else if (seqnum == 0)
+ /* kernel only sends seqnum > 0 */
+ return -EINVAL;
+ }
+
+ r = device_amend(device, key, value);
+ if (r < 0)
+ return r;
+ }
+
+ if (major != 0)
+ *_major = major;
+
+ if (minor != 0)
+ *_minor = minor;
+
+ if (action != _DEVICE_ACTION_INVALID)
+ *_action = action;
+
+ if (seqnum > 0)
+ *_seqnum = seqnum;
+
+ return 0;
+}
+
+void device_seal(sd_device *device) {
+ assert(device);
+
+ device->sealed = true;
+}
+
+static int device_verify(sd_device *device, DeviceAction action, uint64_t seqnum) {
+ assert(device);
+
+ if (!device->devpath || !device->subsystem || action == _DEVICE_ACTION_INVALID || seqnum == 0) {
+ log_debug("sd-device: device created from strv lacks devpath, subsystem, action or seqnum");
+ return -EINVAL;
+ }
+
+ device->sealed = true;
+
+ return 0;
+}
+
+int device_new_from_strv(sd_device **ret, char **strv) {
+ _cleanup_(sd_device_unrefp) sd_device *device = NULL;
+ char **key;
+ const char *major = NULL, *minor = NULL;
+ DeviceAction action = _DEVICE_ACTION_INVALID;
+ uint64_t seqnum;
+ int r;
+
+ assert(ret);
+ assert(strv);
+
+ r = device_new_aux(&device);
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(key, strv) {
+ r = device_append(device, *key, &major, &minor, &seqnum, &action);
+ if (r < 0)
+ return r;
+ }
+
+ if (major) {
+ r = device_set_devnum(device, major, minor);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device: could not set devnum %s:%s: %m", major, minor);
+ }
+
+ r = device_verify(device, action, seqnum);
+ if (r < 0)
+ return r;
+
+ *ret = device;
+ device = NULL;
+
+ return 0;
+}
+
+int device_new_from_nulstr(sd_device **ret, uint8_t *nulstr, size_t len) {
+ _cleanup_(sd_device_unrefp) sd_device *device = NULL;
+ const char *major = NULL, *minor = NULL;
+ DeviceAction action = _DEVICE_ACTION_INVALID;
+ uint64_t seqnum;
+ unsigned i = 0;
+ int r;
+
+ assert(ret);
+ assert(nulstr);
+ assert(len);
+
+ r = device_new_aux(&device);
+ if (r < 0)
+ return r;
+
+ while (i < len) {
+ char *key;
+ const char *end;
+
+ key = (char*)&nulstr[i];
+ end = memchr(key, '\0', len - i);
+ if (!end) {
+ log_debug("sd-device: failed to parse nulstr");
+ return -EINVAL;
+ }
+ i += end - key + 1;
+
+ r = device_append(device, key, &major, &minor, &seqnum, &action);
+ if (r < 0)
+ return r;
+ }
+
+ if (major) {
+ r = device_set_devnum(device, major, minor);
+ if (r < 0)
+ return log_debug_errno(r, "sd-device: could not set devnum %s:%s: %m", major, minor);
+ }
+
+ r = device_verify(device, action, seqnum);
+ if (r < 0)
+ return r;
+
+ *ret = device;
+ device = NULL;
+
+ return 0;
+}
+
+static int device_update_properties_bufs(sd_device *device) {
+ const char *val, *prop;
+ _cleanup_free_ char **buf_strv = NULL;
+ _cleanup_free_ uint8_t *buf_nulstr = NULL;
+ size_t allocated_nulstr = 0;
+ size_t nulstr_len = 0, num = 0, i = 0;
+
+ assert(device);
+
+ if (!device->properties_buf_outdated)
+ return 0;
+
+ FOREACH_DEVICE_PROPERTY(device, prop, val) {
+ size_t len = 0;
+
+ len = strlen(prop) + 1 + strlen(val);
+
+ buf_nulstr = GREEDY_REALLOC0(buf_nulstr, allocated_nulstr, nulstr_len + len + 2);
+ if (!buf_nulstr)
+ return -ENOMEM;
+
+ strscpyl((char *)buf_nulstr + nulstr_len, len + 1, prop, "=", val, NULL);
+ nulstr_len += len + 1;
+ ++num;
+ }
+
+ /* build buf_strv from buf_nulstr */
+ buf_strv = new0(char *, num + 1);
+ if (!buf_strv)
+ return -ENOMEM;
+
+ NULSTR_FOREACH(val, (char*) buf_nulstr) {
+ buf_strv[i] = (char *) val;
+ assert(i < num);
+ i++;
+ }
+
+ free(device->properties_nulstr);
+ device->properties_nulstr = buf_nulstr;
+ buf_nulstr = NULL;
+ device->properties_nulstr_len = nulstr_len;
+ free(device->properties_strv);
+ device->properties_strv = buf_strv;
+ buf_strv = NULL;
+
+ device->properties_buf_outdated = false;
+
+ return 0;
+}
+
+int device_get_properties_nulstr(sd_device *device, const uint8_t **nulstr, size_t *len) {
+ int r;
+
+ assert(device);
+ assert(nulstr);
+ assert(len);
+
+ r = device_update_properties_bufs(device);
+ if (r < 0)
+ return r;
+
+ *nulstr = device->properties_nulstr;
+ *len = device->properties_nulstr_len;
+
+ return 0;
+}
+
+int device_get_properties_strv(sd_device *device, char ***strv) {
+ int r;
+
+ assert(device);
+ assert(strv);
+
+ r = device_update_properties_bufs(device);
+ if (r < 0)
+ return r;
+
+ *strv = device->properties_strv;
+
+ return 0;
+}
+
+int device_get_devlink_priority(sd_device *device, int *priority) {
+ int r;
+
+ assert(device);
+ assert(priority);
+
+ r = device_read_db(device);
+ if (r < 0)
+ return r;
+
+ *priority = device->devlink_priority;
+
+ return 0;
+}
+
+int device_get_watch_handle(sd_device *device, int *handle) {
+ int r;
+
+ assert(device);
+ assert(handle);
+
+ r = device_read_db(device);
+ if (r < 0)
+ return r;
+
+ *handle = device->watch_handle;
+
+ return 0;
+}
+
+void device_set_watch_handle(sd_device *device, int handle) {
+ assert(device);
+
+ device->watch_handle = handle;
+}
+
+int device_rename(sd_device *device, const char *name) {
+ _cleanup_free_ char *dirname = NULL;
+ char *new_syspath;
+ const char *interface;
+ int r;
+
+ assert(device);
+ assert(name);
+
+ dirname = dirname_malloc(device->syspath);
+ if (!dirname)
+ return -ENOMEM;
+
+ new_syspath = strjoina(dirname, "/", name);
+
+ /* the user must trust that the new name is correct */
+ r = device_set_syspath(device, new_syspath, false);
+ if (r < 0)
+ return r;
+
+ r = sd_device_get_property_value(device, "INTERFACE", &interface);
+ if (r >= 0) {
+ r = device_add_property_internal(device, "INTERFACE", name);
+ if (r < 0)
+ return r;
+
+ /* like DEVPATH_OLD, INTERFACE_OLD is not saved to the db, but only stays around for the current event */
+ r = device_add_property_internal(device, "INTERFACE_OLD", interface);
+ if (r < 0)
+ return r;
+ } else if (r != -ENOENT)
+ return r;
+
+ return 0;
+}
+
+int device_shallow_clone(sd_device *old_device, sd_device **new_device) {
+ _cleanup_(sd_device_unrefp) sd_device *ret = NULL;
+ int r;
+
+ assert(old_device);
+ assert(new_device);
+
+ r = device_new_aux(&ret);
+ if (r < 0)
+ return r;
+
+ r = device_set_syspath(ret, old_device->syspath, false);
+ if (r < 0)
+ return r;
+
+ r = device_set_subsystem(ret, old_device->subsystem);
+ if (r < 0)
+ return r;
+
+ ret->devnum = old_device->devnum;
+
+ *new_device = ret;
+ ret = NULL;
+
+ return 0;
+}
+
+int device_clone_with_db(sd_device *old_device, sd_device **new_device) {
+ _cleanup_(sd_device_unrefp) sd_device *ret = NULL;
+ int r;
+
+ assert(old_device);
+ assert(new_device);
+
+ r = device_shallow_clone(old_device, &ret);
+ if (r < 0)
+ return r;
+
+ r = device_read_db(ret);
+ if (r < 0)
+ return r;
+
+ ret->sealed = true;
+
+ *new_device = ret;
+ ret = NULL;
+
+ return 0;
+}
+
+int device_new_from_synthetic_event(sd_device **new_device, const char *syspath, const char *action) {
+ _cleanup_(sd_device_unrefp) sd_device *ret = NULL;
+ int r;
+
+ assert(new_device);
+ assert(syspath);
+ assert(action);
+
+ r = sd_device_new_from_syspath(&ret, syspath);
+ if (r < 0)
+ return r;
+
+ r = device_read_uevent_file(ret);
+ if (r < 0)
+ return r;
+
+ r = device_add_property_internal(ret, "ACTION", action);
+ if (r < 0)
+ return r;
+
+ *new_device = ret;
+ ret = NULL;
+
+ return 0;
+}
+
+int device_copy_properties(sd_device *device_dst, sd_device *device_src) {
+ const char *property, *value;
+ int r;
+
+ assert(device_dst);
+ assert(device_src);
+
+ FOREACH_DEVICE_PROPERTY(device_src, property, value) {
+ r = device_add_property(device_dst, property, value);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+void device_cleanup_tags(sd_device *device) {
+ assert(device);
+
+ set_free_free(device->tags);
+ device->tags = NULL;
+ device->property_tags_outdated = true;
+ device->tags_generation++;
+}
+
+void device_cleanup_devlinks(sd_device *device) {
+ assert(device);
+
+ set_free_free(device->devlinks);
+ device->devlinks = NULL;
+ device->property_devlinks_outdated = true;
+ device->devlinks_generation++;
+}
+
+void device_remove_tag(sd_device *device, const char *tag) {
+ assert(device);
+ assert(tag);
+
+ free(set_remove(device->tags, tag));
+ device->property_tags_outdated = true;
+ device->tags_generation++;
+}
+
+static int device_tag(sd_device *device, const char *tag, bool add) {
+ const char *id;
+ char *path;
+ int r;
+
+ assert(device);
+ assert(tag);
+
+ r = device_get_id_filename(device, &id);
+ if (r < 0)
+ return r;
+
+ path = strjoina("/run/udev/tags/", tag, "/", id);
+
+ if (add) {
+ r = touch_file(path, true, USEC_INFINITY, UID_INVALID, GID_INVALID, 0444);
+ if (r < 0)
+ return r;
+ } else {
+ r = unlink(path);
+ if (r < 0 && errno != ENOENT)
+ return -errno;
+ }
+
+ return 0;
+}
+
+int device_tag_index(sd_device *device, sd_device *device_old, bool add) {
+ const char *tag;
+ int r = 0, k;
+
+ if (add && device_old) {
+ /* delete possible left-over tags */
+ FOREACH_DEVICE_TAG(device_old, tag) {
+ if (!sd_device_has_tag(device, tag)) {
+ k = device_tag(device_old, tag, false);
+ if (r >= 0 && k < 0)
+ r = k;
+ }
+ }
+ }
+
+ FOREACH_DEVICE_TAG(device, tag) {
+ k = device_tag(device, tag, add);
+ if (r >= 0 && k < 0)
+ r = k;
+ }
+
+ return r;
+}
+
+static bool device_has_info(sd_device *device) {
+ assert(device);
+
+ if (!set_isempty(device->devlinks))
+ return true;
+
+ if (device->devlink_priority != 0)
+ return true;
+
+ if (!ordered_hashmap_isempty(device->properties_db))
+ return true;
+
+ if (!set_isempty(device->tags))
+ return true;
+
+ if (device->watch_handle >= 0)
+ return true;
+
+ return false;
+}
+
+void device_set_db_persist(sd_device *device) {
+ assert(device);
+
+ device->db_persist = true;
+}
+
+int device_update_db(sd_device *device) {
+ const char *id;
+ char *path;
+ _cleanup_fclose_ FILE *f = NULL;
+ _cleanup_free_ char *path_tmp = NULL;
+ bool has_info;
+ int r;
+
+ assert(device);
+
+ has_info = device_has_info(device);
+
+ r = device_get_id_filename(device, &id);
+ if (r < 0)
+ return r;
+
+ path = strjoina("/run/udev/data/", id);
+
+ /* do not store anything for otherwise empty devices */
+ if (!has_info && major(device->devnum) == 0 && device->ifindex == 0) {
+ r = unlink(path);
+ if (r < 0 && errno != ENOENT)
+ return -errno;
+
+ return 0;
+ }
+
+ /* write a database file */
+ r = mkdir_parents(path, 0755);
+ if (r < 0)
+ return r;
+
+ r = fopen_temporary(path, &f, &path_tmp);
+ if (r < 0)
+ return r;
+
+ /*
+ * set 'sticky' bit to indicate that we should not clean the
+ * database when we transition from initramfs to the real root
+ */
+ if (device->db_persist) {
+ r = fchmod(fileno(f), 01644);
+ if (r < 0) {
+ r = -errno;
+ goto fail;
+ }
+ } else {
+ r = fchmod(fileno(f), 0644);
+ if (r < 0) {
+ r = -errno;
+ goto fail;
+ }
+ }
+
+ if (has_info) {
+ const char *property, *value, *tag;
+ Iterator i;
+
+ if (major(device->devnum) > 0) {
+ const char *devlink;
+
+ FOREACH_DEVICE_DEVLINK(device, devlink)
+ fprintf(f, "S:%s\n", devlink + strlen("/dev/"));
+
+ if (device->devlink_priority != 0)
+ fprintf(f, "L:%i\n", device->devlink_priority);
+
+ if (device->watch_handle >= 0)
+ fprintf(f, "W:%i\n", device->watch_handle);
+ }
+
+ if (device->usec_initialized > 0)
+ fprintf(f, "I:"USEC_FMT"\n", device->usec_initialized);
+
+ ORDERED_HASHMAP_FOREACH_KEY(value, property, device->properties_db, i)
+ fprintf(f, "E:%s=%s\n", property, value);
+
+ FOREACH_DEVICE_TAG(device, tag)
+ fprintf(f, "G:%s\n", tag);
+ }
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ goto fail;
+
+ r = rename(path_tmp, path);
+ if (r < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ log_debug("created %s file '%s' for '%s'", has_info ? "db" : "empty",
+ path, device->devpath);
+
+ return 0;
+
+fail:
+ (void) unlink(path);
+ (void) unlink(path_tmp);
+
+ return log_error_errno(r, "failed to create %s file '%s' for '%s'", has_info ? "db" : "empty", path, device->devpath);
+}
+
+int device_delete_db(sd_device *device) {
+ const char *id;
+ char *path;
+ int r;
+
+ assert(device);
+
+ r = device_get_id_filename(device, &id);
+ if (r < 0)
+ return r;
+
+ path = strjoina("/run/udev/data/", id);
+
+ r = unlink(path);
+ if (r < 0 && errno != ENOENT)
+ return -errno;
+
+ return 0;
+}
+
+int device_read_db_force(sd_device *device) {
+ assert(device);
+
+ return device_read_db_aux(device, true);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 12:39:25 +0000